drivers/scsi/libfc/fc_fcp.c

Source file repositories/reference/linux-study-clean/drivers/scsi/libfc/fc_fcp.c

File Facts

System
Linux kernel
Corpus path
drivers/scsi/libfc/fc_fcp.c
Extension
.c
Size
61399 bytes
Lines
2321
Domain
Driver Families
Bucket
drivers/scsi
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct fc_fcp_internal {
	mempool_t		*scsi_pkt_pool;
	spinlock_t		scsi_queue_lock;
	struct list_head	scsi_pkt_queue;
	unsigned long		last_can_queue_ramp_down_time;
	unsigned long		last_can_queue_ramp_up_time;
	int			max_can_queue;
};

#define fc_get_scsi_internal(x)	((struct fc_fcp_internal *)(x)->scsi_priv)

/*
 * function prototypes
 * FC scsi I/O related functions
 */
static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code);
static void fc_fcp_timeout(struct timer_list *);
static void fc_fcp_rec(struct fc_fcp_pkt *);
static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
static void fc_io_compl(struct fc_fcp_pkt *);

static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);

/*
 * command status codes
 */
#define FC_COMPLETE		0
#define FC_CMD_ABORTED		1
#define FC_CMD_RESET		2
#define FC_CMD_PLOGO		3
#define FC_SNS_RCV		4
#define FC_TRANS_ERR		5
#define FC_DATA_OVRRUN		6
#define FC_DATA_UNDRUN		7
#define FC_ERROR		8
#define FC_HRD_ERROR		9
#define FC_CRC_ERROR		10
#define FC_TIMED_OUT		11
#define FC_TRANS_RESET		12

/*
 * Error recovery timeout values.
 */
#define FC_SCSI_TM_TOV		(10 * HZ)
#define FC_HOST_RESET_TIMEOUT	(30 * HZ)
#define FC_CAN_QUEUE_PERIOD	(60 * HZ)

#define FC_MAX_ERROR_CNT	5
#define FC_MAX_RECOV_RETRY	3

#define FC_FCP_DFLT_QUEUE_DEPTH 32

/**
 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
 * @lport: The local port that the FCP packet is for
 * @gfp:   GFP flags for allocation
 *
 * Return value: fcp_pkt structure or null on allocation failure.
 * Context:	 Can be called from process context, no lock is required.
 */
static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
{
	struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
	struct fc_fcp_pkt *fsp;

	fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
	if (fsp) {
		memset(fsp, 0, sizeof(*fsp));
		fsp->lp = lport;
		fsp->xfer_ddp = FC_XID_UNKNOWN;
		refcount_set(&fsp->ref_cnt, 1);
		timer_setup(&fsp->timer, NULL, 0);
		INIT_LIST_HEAD(&fsp->list);
		spin_lock_init(&fsp->scsi_pkt_lock);
	} else {
		this_cpu_inc(lport->stats->FcpPktAllocFails);
	}
	return fsp;
}

/**

Annotation

Implementation Notes